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while the voltage on the battery may be perfect with a multimeter on a still test , what is the battery voltage when trying to crank the engine. If the voltage drops to below 10 volts you have a battery problem. All headlights dim while cranking and the flatter the battery the greater the dim of the lights. It is bad practice to have the lights on while trying to crank the engine as the current draw for the lights takes power away from the ECM and ignition system

Sounds like maybe bad battery cables , positive or the ground side ! You need to do a voltage drop test to see which one. Need to use volt ohm meter ! Put positive lead on the positive connection at battery , next put negative meter lead at the connection on the starter. Make sure the vehicle won't start by pulling fuel pump fuse. Have someone turn the and crank the engine , If the meter reads less then battery voltage while cranking that cable is bad and needs to be replaced. I'll also send a link for a you tube video on doing the test. Voltage Drop Testing the Starter

the crank position sensor will never tell a vehicle to crank. the purpose of the crank position sensor is to detect misfires and also for engine timing. when a vehicle does not crank you need to look at starting system. check your battery, load test it. check for starter signal to starter solenoid from ignition switch.

More than likely the charging system is not working and allowing the battery to run down/low. Put a voltmeter on the battery and raise the engine about 2000 rpm and the battery should read 13.5-15.5 volts with all electronics on (fans switch on high, flashers, wipers, headllights, defrost etc). It should also read about 13.5 volts at idle but may not depending on the load from the accessories and voltage regulator. Most important is that it will read 13.5-15.5 volts when the engine is at 2000 rpm with the accessories on. If it does not read in that range the charging system(alternator most likely) has a charging problem.

Did the old engine start ok? If so then take a good look at the Crank Position Sensor or the flywheel sensor ring. Some times the flywheel ring can get bent/damaged during an engine swap. It doesn't take much to dent that ring and it is really close to the CPS. The other thing you can try is turn the key on without starting several times before cranking. This will pulse the fuel pump each time and charge up the fuel pressure. If that works you have a fuel pressure issue (probably a pump) Let me know how it goes.